code: def is_numeric_feature(attr):
      for x in set(attr):
          if not x == "?":
              try:
                  x = float(x)
                  return isinstance(x, float)
              except ValueError:
                  return False
      return True
  
file_path: imodels/imodels/tree/c45_tree/c45_utils.py
imports: import math
label_desc: Use image node_id 2 for calling a global function with example usage: is_numeric_feature(attr) and returns: True, isinstance, False